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Thank you for your help! Okay, here are my technical secrets: my videos were taken with an older HDV-camcoder (Canon-XHA1). For macro videos I additionally use one or a combination of two acromatic lenses (5 dioptres), a ring light and always a tripod. The picture in this threat is automatic generated from the frame in the middle of the video and served from wikimedia-commons. I'll try to submit it (never done before...). Greetings, Ingo